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That's correct, it's a mime type declaration added to the metadata. As far as I know it's a "for the form" thing, and not absolutely required, but I place it in the files (epub gets its proper mimetype as well) because I am trying to offer a "proper and complete" metadata section.
And Hitch is of course correct regarding the file I am retrieving after KDP converts it. It is a fully-formed dual spec mobi. Not much goes on after that point, particularly considering I do not enable DRM on any of my files. (Though apparently some reseller partners of some of the places I upload to do, which pisses me off. But that's another issue.)
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